OSA's Digital Library

Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 35, Iss. 10 — May. 15, 2010
  • pp: 1623–1625

Photoacoustic radar imaging signal-to-noise ratio, contrast, and resolution enhancement using nonlinear chirp modulation

Bahman Lashkari and Andreas Mandelis  »View Author Affiliations

Optics Letters, Vol. 35, Issue 10, pp. 1623-1625 (2010)

View Full Text Article

Enhanced HTML    Acrobat PDF (281 KB)

Browse Journals / Lookup Meetings

Browse by Journal and Year


Lookup Conference Papers

Close Browse Journals / Lookup Meetings

Article Tools



Cross-correlation (radar) frequency-domain photoacoustic (PA) imaging parameters [signal-to-noise ratio (SNR), contrast, and spatial resolution] are explored. The application of nonlinear frequency modulation instead of the standard linear frequency chirps is investigated. In addition to the image produced by the amplitude of the cross correlation between input and detected signals, the phase of the correlation signal is used as a filter of the PA amplitude combined with linear or nonlinear frequency chirps to improve SNR, contrast, and spatial resolution. The experimental results with a high-frequency transducer exhibit more than 10 and 8 times contrast enhancement using nonlinear and linear chirps, respectively. Concomitant improvements in SNR and image resolution were also observed.

© 2010 Optical Society of America

OCIS Codes
(110.5120) Imaging systems : Photoacoustic imaging
(110.5125) Imaging systems : Photoacoustics

ToC Category:
Imaging Systems

Original Manuscript: October 9, 2009
Revised Manuscript: March 25, 2010
Manuscript Accepted: April 19, 2010
Published: May 6, 2010

Bahman Lashkari and Andreas Mandelis, "Photoacoustic radar imaging signal-to-noise ratio, contrast, and resolution enhancement using nonlinear chirp modulation," Opt. Lett. 35, 1623-1625 (2010)

Sort:  Author  |  Year  |  Journal  |  Reset  


  1. S. A. Telenkov, A. Mandelis, B. Lashkari, and M. Forcht, J. Appl. Phys. 105, 102029 (2009). [CrossRef]
  2. S. A. Telenkov and A. Mandelis, J. Biomed. Opt. 14, 044025 (2009). [CrossRef] [PubMed]
  3. C. E. Cook and M. Bernfeld, Radar Signals: an Introduction to Theory and Application (Artech House, 1993).
  4. T. Misaridis and J. A. Jensen, IEEE Trans. Ultrason. Ferroelectr. Freq. Control 52, 192 (2005). [CrossRef] [PubMed]
  5. M. S. Patterson and F. S. Foster, Ultrason. Imaging 5, 195 (1983). [CrossRef] [PubMed]
  6. American National Standards Institute, American National Standard for the Safe Use of Lasers in Health Care Facilities: Standard Z136.1-1993 (ANSI, Inc., 1993).

Cited By

Alert me when this paper is cited

OSA is able to provide readers links to articles that cite this paper by participating in CrossRef's Cited-By Linking service. CrossRef includes content from more than 3000 publishers and societies. In addition to listing OSA journal articles that cite this paper, citing articles from other participating publishers will also be listed.


Fig. 1 Fig. 2 Fig. 3
Fig. 4

« Previous Article  |  Next Article »

OSA is a member of CrossRef.

CrossCheck Deposited